Drawing apparatus utilizing parallel movements



M. BIEUVILLE. DRAWING APPARATUS UTILIZING PARALLEL MOVEMENTS.

APPLICATION FILED OCTIZG, I920. 1,408,252, I Patented Feb. 28, 1922.

2 SHEETSSHEET I.

M. BIEUVILLE. DRAWING APPARATUS UTILIZING PARALLEL MOVEMENTS.

APPLICATION FILED OCT. 26, I920. 1,408,252, Patented Feb. 28, 1922.

2 5HEETS-SHEET 2.

INVEN'TOK M/YRCEL BI'EuJ/LuE H 110 Eng 5 MARCEL BIEUVILLE, OF IBELLEVUE, FRANCE.

DRAWING APPARATUS UTILIZING PARALLEL MOVEMENTS.

Specification of Letters Patent. Patented Feb. 28, 1922.

Application filed October 26, 1920. Serial No. 419,766.

To all whom it may concern:

Be it known that I, MARGEL BIEUVILLE,

' a citizen of the Re ublic of France, residing at Bellevue, eine-et-Oise, France, 8 Avenue Gallieni, have invented a new and useful Improvement in Drawing Apparatus Utilizing Parallel Movements, (for which I have filed applications in France Oct. 24, 1919, andJan. 25, 1920, and in Germany Nov. 6, 1919,) of which the following is a specification.

This invention relates to drawing apparatus utilizing parallel movements, the said apparatus consisting of a series of arms pivoted to each other, each arm being a rod, to each of the ends of which is pivoted a pulley, the connection between the said pulleys being ensured by a flexible band say of steel, the first pulley of the first arm being fixed, and the last pulley of the last arm carrying the drawing instrument.

In the apparatus of that'kind it is impossible, under the penalty of increasing the weight of the apparatus, to give the rods supportin the pulleys sufiicient cross-sections to o tain a perfect rigidity this results in deformations which are transformed into a tension of one section of the flexible band and in a slackening of the other section, which gives rise to errors which sometimes reach several millimeters. Moreover, the band sections not being protected by any part, are liable to be hooked or caught and consequently to interfere with convenient and quick use of the instrument. The present invention relates to a construction of an apparatus which is free from the drawbacks just mentioned.

The apparatus according to the invention is characterized by the fact that each arm,-

at the ends ofwhich are pivoted the pulleys over which passes the steel band, forms a gear case for the said band, the said gear case can be a single one for the two sections or separate for each section.

The invention relates also to the erecting of the drawing instrument on a part concentric with the head pulley of the apparatus, forming a cover for the said pulley, movablerelatively to the same and capable of being locked by the tightening of a screw forming a brake, so that it is possible to give the drawing instrument orientation in any desired direction and to lock it afterwards in the said direction.

The accompanying drawing shown by way of example various constructions of the apparatus according to the invention.

Figures 1 to 5 relate to a first construction in which each arm is constituted by two shackles connected together by two parallel tubes in the interior of which passes the steel band, the tension of which is ob tained by rotating a screwthreaded sleeve arranged on each tube.

Figure 1 isa plan of the whole of the apparatus,

Figure 2 is, on an enlarged scale, a detail vlew in plan of the head pulley,

Figure 3 is a vertical section on line 3-3 of Figure 2,

Figure 4 is apartial horizontal cross-section on line 4- 1 of Figure 3,

Flgure 5 is a partial vertical section on l1ne 55 of Figure 2.

F lgures 6-8 relate to a construction of an apparatus in which the two sections of one and the same arm are mounted in the interior of a single gear case.

Figure 6 is an elevation, Figure 7 a horizontal section on line 7-7 of Figure 6 and Figure 8 a vertical section on line 88 of Figure 7 Finally, Figure 9 is a plan of a simplified construction.

Each arm such as A or B is constituted by two tubes a arranged parallelto eachother and connected together at their ends by articulation shackles b of stamped out sheet metal, brazed on the said tubes. The pulleys 0 0' and d d are pivoted between thebranches e of forks forming part of the shackles b. The pulley c is secured to a part 7 pivoted to a plate 9 intended to be secured to the drawing table.

The distance between the tubes a is such that the flexible bands which connect together the pulleys c c and d d, pass without friction in the interior of each of the said tubes;

Towards one of its ends, each tube 1; carries between it and the hinge shackle, a sleeve h with screwthread with right and left hand screw so as to enable the bands to be tightened.

The head pulley 01 (Figures 2 and 3) is hollow and has a cover a; the said cover to which is secured by means of a suitable device the drawing instrument, for instance a set square, is movable about the axis of the pulley d" and can be locked relatively tothesaid pulley by means of the following .de-

. gagement with any the centre of Vice: On the cover 2' is mounteda screw j, the head j of which comprises a slot 7' with which enga es a circular projectionk of the pulley al t e tightening of the nut Z of the screw j brings about the rising-of the said screw and therefore its looking on the projection is, which results in looking the cover 6 relatively to the pulley al To facilitate the operation of the nut, Z, the latter is provided on its a set of teeth m forming a pinion 1n engagement with a toothed quadrant n also pivoted on the cover 2' and operated by means of a lever 72, A spring n acts on the toothed quadrant n so as to produce constantly the lockin of the screw j on the projection 72. A slig t pressure on the lever n produces the unlocking, so as to allow the drawing instrument to be given the desired direction; as soon as the lever n has been released, the spring n produces automatically the tightening.

Under the cover 2' is secured a small blade 0 forming a spring, the free end of which has a projection 0 intended to come into enof the recesses p provided in the upper part of the circular projection k. These recesses made for instance at intervals of 30-45 and 60 at either side of the zero, enable the drawing apparatus to be given the desired direction Without having recourse to the graduation provided on the cover 2'.

A handle 9 secured to the cover 2' of the head pulley d facilitates the working of the ap aratus. k

0 ensure correct contact of the pulley d and of its cover, the latter is exposed the intermediary of a small split cone 9" to the action of round the axis of rotation of the pulley; the split cone r is intended to take up for the play of the cover relatively to its axis.

" e connection of the cover 11 and of the drawing instrument secured to the head pullo 0?, is effected through the intermediary cover 71. According to the second construction, in the pulley c is pivoted a tube 4), the other end of which carries the pulley c of the same diameter as pulley c.

The other arm is also constituted by a tube v in theinterior of which are mounted the pulleys d and d. The pulley c is locked relatively to the plate 0 and the pulley d drawing instrument. secured to the pulleys c 0 and d d is obtained by means of turn-buckles a The apparatus shown'in Figure 9, comprises two bars y each secured to a pulley carries as before the periphery with g by means of a screw.

Tension of the bands 0; these bars are connected together by means of a pivoted arm constituted for instance by a tube 12 of rectangular cross-section; over the pulle s 0 passes as before a flexible band secured to the rim by any desired means, such as screws etc.

It is obvious that the invention is by no means limited to the constructional details just described; thus for instance the sha of the tubes, the method of stretching th steel bands could be mountin of the drawing instrument on the head pufiey of the apparatus.

Claims:

1. A drawing apparatus utilizing parallel movements comprising a drafting board, a

an arm adapted to pivot on the axis of the fixed pulley, and connecting the fixed pulley and one of the pulleys of said pair, another pulley, a dra ting instrument carried thereby, an arm connecting said last named pulley and thesecond pulley of the 'pair and adapted to pivot on the axis of each of said pulleys, an endless band passing over the fixed pulley and the first of the pair of pulleys, and another endless band passing over the second of the pair of pulleys and the pulley carrying the drawing instrument, each of said arms encasing its said endless ban 2. A drawing apparatus utilizing parallel movements comprising a drafting board, a ulley, means for securing said pulley in xed position on said drafting board, a pair of pulleys rotating on the same axis, an arm adapted to pivot on the axis of the fixed pulley, and connecting the fixed pulley and one of the pulleys of said pair, another pulley, a drafting instrument carried thereby, an arm connecting said last named pulley and the second pulley of the air and adapted to pivot on the axis of eac of said pulleys, an endless band passing over the fixiald pulley and the first of the pair of u o ver the second of the pair of the pulley carrying the drawing instrument, each of said arms consisting of two tubes, shackles connecting the tu es together at each end so that said metal bands can pass therethrough conveniently, said shackles forming axes for the pulleys.

' 3. A drawing apparatus utilizing parallel movements comprising a drafting board, a pulley, means for securing said pulley in fixed position on said drafting of pulleys rotating on the same axis, an arm adapted to pivot on the axis of the fixed pulley, and connecting the fixed pulley and one of the ulleys of said pair, another pulley, a dra ing instrument carried thereby, an arm connecting said last named pulley pulleys and board, a pair 7 and the second pulley of the pair and ada ted to pivot on the axis of each of said pul eys, an endless band passing over the fixed pulley and the first of the pair of 5 pulleys, another endless band passing over ,the second of the pair of pulleys and the pulley carrying the drawing instrument, each of said armsconsisting of two parallel vtubes, shackles connecting the tubes to- 10 gather at each end so that said metal bands can pass therethrough conveniently and each of said shackles forming axes for the pulleys, and a threaded tightening sleeve on each tube between the latter and one of the shackles on which it is mounted.

In testimony whereof I have signed my name to this specification.

MARCE-L BIEUVILLE. 

